c Summary: Direct unformatted read beyond EOF cores
c This program demonstrates a bug in gfortran/libgfortran.
c The bug is that a
c program dumps core when reading beyond the end of
c a access='direct', form='unformatted' file instead
c of transfering control to 'err=' label.
c Also, returns incorrectly when reading at end of file.
c To test
c dd if=/dev/zero of=shortfile bs=11811 count=1
c ./a.out
c Bus error (core dumped)
c dd if=/dev/zero of=shortfile bs=11812 count=1
c ./a.out
c should not get here
c before 779 inbuf(1)= 32
c STOP 0
c Note: in the above case, the value of inbuf(1) got set to a space
c When compiled with ifort or g77, the correct output is produced
c in both cases.
c ./a.out
c at 779, all is good
c Problem occurs in
c GNU Fortran 95 (GCC 4.0.1)
c GNU Fortran 95 (GCC 4.0.2 20050804 (prerelease))
c GNU Fortran 95 (GCC 4.1.0 20050806 (experimental))
c gfortran -v
c Using built-in specs.
c Target: i686-pc-linux-gnu
c Configured with: ../../NetSrc/gcc-4.1-20050806/configure
--prefix=/home/bswift/afrl/
builddev/NetInst/gcc-4.1-20050806 --enable-languages=c,f95
--with-gmp=/home/bswift/afrl/
builddev/NetInst/gmp-4.1.4
--with-mpfr=/home/bswift/afrl/builddev/NetInst/mpfr-2.1.2
c Thread model: posix
c gcc version 4.1.0 20050806 (experimental)
implicit none
integer nbytes
integer inbuflen
parameter (inbuflen=32768)
integer*1 inbuf(inbuflen)
integer k
inbuf(1)=5
nbytes=11812
open(35,file='shortfile',access='direct',recl=nbytes,form
$ ='unformatted')
read(35,rec=2,err=779) (inbuf(k),k=1,nbytes)
write(*,*) 'should not get here'
write(*,*) 'before 779 inbuf(1)=',inbuf(1)
stop
779 write(*,*) 'at 779, all is good'
end
--
Summary: Direct unformatted read beyond EOF cores
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: libfortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bsp at kithrup dot com
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23321
